60151

Chromium(III) potassium sulfate dodecahydrate

puriss. p.a., ACS reagent, ≥99.0% (RT)

• Synonym(s): Chrome alum, Potassium chromium(III) sulfate dodecahydrate
• Linear Formula: CrK(SO₄)₂ · 12H₂O
• CAS Number: 7788-99-0
• Molecular Weight: 499.40
• EC Number: 233-401-6
• MDL number: MFCD00149917
• UNSPSC Code: 12352300
• PubChem Substance ID: 329758770

Properties

• grade: ACS reagent; puriss. p.a.
• assay: ≥99.0% (RT)
• form: crystals
• mp: 89 °C (lit.)
• solubility: water: soluble(lit.)
• anion traces: chloride (Cl^-): ≤20 mg/kg
• cation traces: Al: ≤200 mg/kg; Ca: ≤100 mg/kg; Cd: ≤5 mg/kg; Co: ≤5 mg/kg; Cu: ≤10 mg/kg; Fe: ≤100 mg/kg; Mg: ≤5 mg/kg; Mn: ≤5 mg/kg; NH₄⁺: ≤100 mg/kg; Na: ≤500 mg/kg; Ni: ≤5 mg/kg; Pb: ≤50 mg/kg; Zn: ≤10 mg/kg
• SMILES string: O.O.O.O.O.O.O.O.O.O.O.O.[K+].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O
• InChI: 1S/Cr.K.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4
• Inchi Key: ZFVHBEKVAITXHW-UHFFFAOYSA-J

Description

General description

Chromium(III) potassium sulfate dodecahydrate (Potassium chromium(III) sulfate dodecahydrate, Chrome alum) is a violet colored solid. It has been synthesized by reacting sulfur dioxide with potassium dichromate (dissolved in sulfuric acid) at -38°C. It is widely used chemical in dyeing and textile industry.[1]

Application

Chromium(III) potassium sulfate dodecahydrate (KCr(SO₄)₂.12H₂O) has been used for coating the slides for microscopic studies on Periplaneta americana.[2][3] It may be used in the preparation of quasi-monodisperse spherical core-shell particles of Cr/α-Cr₂O₃.[4]

Safety Information

• Pictograms: GHS07
• signalword: Warning
• hcodes: H315,H319
• pcodes: P264 - P280 - P302 + P352 - P305 + P351 + P338 - P332 + P313 - P337 + P313
• Hazard Classifications: Eye Irrit. 2 - Skin Irrit. 2
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3